The new species Eohiodon woodruffi is the second known species of the fossil hiodontid genus Eohiodon. It occurs in Middle Eocene freshwater tuffaceous shales of the lower Tom Thumb Tuff Member and the Middle Member of the Klondike Mountain Formation, near Republic, Washington. The new species differs from Eohiodon rosei in having more anal fin rays and in being deeper bodied. Eohiodon woodruffi also occurs with Eohiodon rosei in Eocene sediments near Horsefly, British Columbia.

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